Shears or scissors grinding apparatus.



No. 811,202. PATENTED JAN. 80, 1906.

E. F. DAVIS. SHEARS 0R SCISSORS GRINDING APPARATUS.

APPLICATION FILED SEPT.26.1904.

2 SHEETSSHEET 1.

UNITED STATES PATENT OFFICE. EDWARD r. DAVIS, F LYNN, MASsAonUsnrrs, ASSIG-NOR or ONE-FOURTH in WARREN n. CALDER, or LYNN, MASsAoHUsnrrs.

SHEARS OR SCISSORS GRINDING APPARATUS.

Specification of Letters Patent.

Patented Jan. 30, 1906.

' Application filed Beptember 26, 190 Serial No 225,895.

To all whom it may concern.-

Be it known that I, EDWARD F. DAVIS, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented an Improvement in Shears or Scissors Grinding Apparatus, of which the following description, in connec tion with the accompanying drawings, isa specification, like characters on the drawings representing like parts:

This invention has for its object the production of a novel apparatus for grinding shears, scissors, and the like.

The machine comprises an emerywheel, which is rotated, and a clamp for holding the shear-blade, the clamp being moved longitudinally that the edge of the blade may be acted on from one to its other end.

I have shown the apparatus as provided with a locking device that prevents the rotation of the emery-wheel until, for instance, the locking device is unlocked by the insention of a coin, for the apparatus may be started and turned. for a sufficient length of Fig. 1.

, vided with a clamp.

time to grind shears or scissors, when the apparatus will be again locked, but can be started again by the insertion of a coin.

Figure 1 in rear elevation shows a grinding apparatus embodying my invention in one of the best forms now known to me. Fig. 2 is a detail to the left of the dotted line as, Fig. 1. Fig. 3 is a detail showing the bell and apparatus for moving the hammer for striking the bell at the desired time. Figs. 4, 5, and 6 represent specific details of the locking feature, to be hereinafter referred to. Fig. 7 is a left-hand end view of the machine shown in Fig. 8 is a section through the screw and uide-rod, showing the carriage sustain- "ng the shear-carrier, which in practice is pro- Figs. 9 and 10 are de tails of the clamp.

The framework of the apparatus herein to be described comprises a base A, adapted to be connected to a bench or other platform A by suitable screws A The base has rising therefrom suitable uprights A that sustain the working parts of the machine. The main shaft B of the machine is provided, as shown, with a belt-pulley B, having a handle 13*, bywhieh to rotate the same, said pulley driving a belt B that is extended over a smaller beltpulley B connected with a shaft B mounted in suitable bearings of arms A and provided at its opposite end with a large driving-wheel B, over which is extended a driving-belt B, that in turn contacts with the grooved hub 13*, connected with the shaft B", which shaft carries the emery or other suitable grinding wheel B which is rotated at speed to effect the grinding of the edges of the shears or scissors. The shaftB has a toothed gear 0, that engages and rotates in unison with it a toothed gear C, fast on a stud Cflsustained in the framework, the two gears C and C being rotated in opposite directions. Either of these gears is made a driver for a pinion C secured to the end of a screw O, sustained in a swinging frame or yoke C, mounted to turn about a center 0.

A spring 0 (see Fig. 7) acts normally to keep the pinion C in mesh with the gear 0 and turn the screw-shaft in a direction to cause the movement of the shears to be described in a direction to cause the stone to act from near the pivotal point of the shears to the point thereof.

The shears havin been round alon the i edge, as described, it is frequently desirable to reverse the movement of the shears, that the grinding-wheel may act longer upon the edge, and to effect this the user of the apparatus will operate a rod a, that in turn is jointed to an arm a, extended from the rocking frame referred to, so that said frame and its screw-shaft and pinion may be turned from the position shown .in Fig. 7 to the left, that the pinion C may be engaged by the gear C and the direction of rotation of the screw be'reversed.

The screw is embraced by the lower ends or hubs b of a two-part carriage b 6 said hubs being tapped to receive the screw and be slid longitudinally by the rotation of the screw.. The upper end of the part b of the carriage has a stud b, that enters a slot b in the depending arm of the part b of the carriage, (see Fig. 8,) the upper end of the part I)? being bored to receive a short tube bi) see Fig. 1 that embraces and slides freely on the guide-rod b, sustained in a yoke 6', having cars and connected with the framework by a bolt b The short tube 6 is embraced by the foot of an arm 0, provided at its lower end, as shown, with an eye 0, with which is engaged a spring 0 the lower end of the spring being connected, as may be desired, with one or the other of the series of hooks c 0 according to the weight of the shears or scissors being ground.

The arm 0 has a hole 2 at its upper end, (see Fig. 8,) that receives a stud-screw 3, Fig. 1, the latter receiving loosely over it an ear 4 of a clamp-holder (Z, said clamp-holder receiving loosely through that part thereof at right angles to the ear 4 a right-angled stud extended therethrough loosely from the rear side of the main member 6 of the shears or scissors clamp, the other member being a thumb-screw e, the threaded part of which enters a hole tapped in the main member a in line with the longitudinal axis of the stud. The free end (see Figs. 7 and 10) of this stud is threaded to receive a nut (Z a spring d being interposed between the nut and the clamp-holder to aid in holding the clamp in any position in which it may be placed by the person using the apparatus.

To insert a pair of shears into the machine to be ground, the thumb-screw will be loosened and the back of the shearblade will be inserted between the thumb-screw and the face of the main part of the clamp, the back of the shears or scissors meeting suitable stops 6, (see Fig. 9,) and thereafter the thumb-screw will be set up, clamping the shears or scissors blade and holding the same firmly while the emery-wheel is being rotated to grind the same. The handle f of the shear or scissor blade being ground will be engaged by one hand of the person, for instance, who is looking after the grinding, and it may be the same person who is turning the wheel B.

The arm 0 may be turned up or down on the tube surrounding the guide-rod I)", and the edge of the shears or scissors may be held with greater or less force, as may be desired, againstthe grinding-wheel. I have shielded the rear part of the grinding-wheel by a hood g.

Thus far I have described the grindingwheel and the means for moving it, and I will now describe the mechanism for locking the apparatus to restrain its use except by authorized persons.

It is contemplated placing the machine herein described in barber-shops and other places where scissors will be ground, and to insure that the apparatus bring in an income means have been provided to lock the apparatus, so that it could not be rotated except, for instance, by the placing of a coin in the apparatus. To provide for this, the framework sustains at its rear side a casing comprising disks h h, which in practice will be embraced by a suitable covering, so that the apparatus sustained by the disks and inclosed within the covering may be shielded from being tampered with. In the drawings I have omitted the shields or covering, showing only the holes in the disks, to which the shields may be attached. The left hand shield sustains a stud 7L2, (see Fig. 2,) on

which is mounted loosely a ratchet-toothed wheel its, having a lateral tooth ht. The ratchet-wheel 7b3 is rotated intermittingly or step by step by projections 8, connected with a collar 9, secured to the main shaft B by means of a set-screw 10. The disk h has a projection 7f at its inner side, and within said projection the disk sustains a stud-screw 7L6, on which is mounted loosely a ratchet-toothed wheel if, having a connected plate h, provided with a cam-ledge k and with a locking projection h". The toothed wheel h is engaged by the tooth h and moved one step at every revolution of the ratchet-toothed gear h The disk it has extended above it a chute m, comprising two plates held together by suitable screws m there being between said plates a threat (shown best by dotted lines, Fig. 3) into the mouth 10 of which is inserted a coin, which may be a nickel. The lever or arm m is slotted vertically to constitute a pocket, in which enters the coin dropped into the chute, the lower edge of said coin meeting the inturned end a (see Fig. 4 and 5) of a coin-rest, shown as an arm ofwire, standing vertically in a hole in said lever or arm and having at its upper end another armwith which is connected a spring a, the latter normally keeping the lower bent end of the rest across the pocket referred to, so that the coin is retained therein until the rest is moved, as will be described, to withdraw its lower bent end from underneath the coin. The lever or arm m is mounted on a pivot m sustained in an ear m extended from the disk 8. The opposite end of the lever '77? has a yielding finger m, (see Fig. 5,) that enters a loop m connected with the rear side of a locking-arm m the acting end of which is normally overbalanced to stand in the path of movement of the locking projection it referred to, and when said locking-lever occupies the position shown in the drawings the driving mechanism is locked. The locking lever m is also mounted loosely on the opposite end of the stud m", and said lever has extended therefrom an arm m, on which is adjustably mounted a weight, being normally located so as to let the end m remain down, the weight, however, being adjustable to accommodate the weight of the coin used.

Assuming that a coin is dropped into the chute, it leaves the chute and enters the pocket in lever m, turns the same so that the yielding arm m, the end of which is in contact with the loop m lifts the heavier end of the slightly-overbalanced locking-lever m from the position shown in the drawings sufficiently to let the locking projection h" pass the end of said lever,'which it will do when the apparatus is started by turning the wheel B after dropping a coin into the chute.

The cam represented by 7L8 is supposed to be rotated in the direction of the arrow there on, Figs. 2 and 3, and gradually the low part ICC of said cam meets a shoe 20 at one end of an arm 21 on the hammer-lever 22, pivoted at 23, said shoe being normally kept pressed toward said cam ledge by a spring 24, the free end of which engages a notched projection 25 of said lever. The hammer-lever when the heel or high part of the cam-ledge m passes the shoe is turned normally by the spring 24, so that the upper end of said lever meets and strikes a gong-bell p of usual construction. Just before the shoe leaves the heel of the cam-ledge the hammer-lever meets the upper arm 14 of the coin-rest (see Fig. 3) and turns the same against the stress of the spring a, removing the lower end of the rest from its position crossing the pocket of the lever m .etting the coin drop. The speed. of movement of the cam-ledge is such that by the time the hammer-lever meets the shoulder the grinding-wheel has been moved for a sufiicient length of time to grind one of the blades of the shears.

As herein provided for, a nickel will be required for grinding each blade of the shears or sclssors.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a machine of the class described, a grinding-wheel, a carriage having a shearclamp mounted thereon, means for swinging the carriage toward and from the grinding wheel, a screw-shaft engaging one end of said carriage, means for turningthe screw-shaft in one direction, means for turning the screwshaft in the opposite direction, and a swing ing frame carrying said screw-shaft, whereby it may be swung into operative relation with either of said means. i

2. In a machine of the class described, a carriage, shear clamping means sustained thereby, a grinding-wheel, said carriage having a swinging movement to carry the shearclamping means toward and from the grinding-wheel, devices for moving the clamp and carriage with relation to the grinding-wheel that the grinding-wheel may act from one to the other end of the shear blade, and oppositely-acting means selectively engaging said devices to cause it to move the clamp and carriage in opposite directions.

3. In a machine of the character described, a grinding-stone, a carriage, a shear-clamp supported thereon, a screw for reciprocating sald carriage and clamp to move the shearblade across the edge of the grinding-stone and means for reciprocating said. carriage, said means consisting of a main drive-shaft, a gear thereon, an intermediate gear or pinion mounted on the aforesaid screw and a reversing-gear mounted in the framing of the ma chine and means for engaging the intermediate gear with. driving-gear or the reversinggear.

ing mounted 4. In a machine of the character described, a grinding-stone, a carriage, an arm mounted on saidcarriage, a shear-clamp carried by said arm, a guide-rod, a screw and means for operating said screw to move the shear-blade across the face of the stone, said means consisting of a drivinggear, an intermediate pinion or gear mounted upon the screw, and a reversing-gear, said drive-gear and reversing gear being continually in mesh, and means for selectively engaging the intermediate pinion with either the driving-gear or reversing-gear.

5. In a machine of the character described, a grinding-stone, a two-part carriage, an arm supported thereby, a clamp thereon, a screw for operating said two-part carriage, a swingmg yoke carrying said for imparting direct and reverse rotary motion to said screw, said set of gearing consisting of a driving-gear, a reversing-gear and an intermediate gear, said intermediate gear beon the screw.

6. In a machine of the character described, a grinding-stone, a two-part carriage, an arm mounted thereon, a clamp supported thereby, a screw for operating the carriage, a set of gearing for imparting rotary motion in either direction to said screw, said set of gearing comprising a drive-gear, a reversing-gear, and an intermediate gear and spring-controlled means for throwing said intermediate gear into or out of mesh with either of the other gears.

7. In a machine of the character described, a grinding-stone, a two-part carriage, an arm mounted thereon, a clamp supported thereby, a screw for operating the carriage, a swinging yoke carrying said screw, a set of gearing for imparting rotary motion in either direction to said screw, said set of gearing comprising a drive-gear, a reversing gear, and an intermediate gear, said intermediate gear being mounted on the said screw, said swinging yoke being mounted to turn about a center between the axis of rotation of the drive-gear and the axis of rotation of the reversing-gear, whereby in rocking the said yoke in one or the other directions, the intermediate gear will be brought into mesh with one or the other of the aforementioned gears.

8. I11 a machine of the character described, a grinding-stone, a guide-rod, a two-part carriage mounted to slide on said guide-rod and means for reciprocating said two-part carriage, the two parts of said carriage being pivoted together other. p

9. In a machine of the character described, a grinding-stone, a guide-rod, a two-part carriage mounted to slide on said guide-rod and means for reciprocating said two-part carriage, the two parts of said carriage being pivoted together in a sliding relation to each in a sliding relation to each screw, a set of gearing other, and a spring connected to said pivoted two-part carriage, means to guide the same,

parts to counterbalance the weight of the means to slide the same, an arm engaging shears or other article being ground.

10. In a machine of the class described, a grinding-Wheel, a two-part carriage, a shearclamp mounted thereon, a guide-rod for one end of said carriage, a screw-shaft engaging the other end of said carriage and provided with a pinion, a swinging frame carrying said screw-shaft, an oppositely-moving toothed Wheel with either of which said pinion may be engaged to rotate said screw in one or the other direction.

11. In a machine of the class described, a

said carriage and provided Witha shear-clamp and an adjustable spring to more or less counterbalance the weight of the shears held in the clamp. y

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

EDWVARD F. DAVIS.

IVitnesses:

GEO. W. GREGORY, WARREN H1 CALDER. 

